WELCOME to DC Kevin, and
CONGRATULATIONS on becoming a WDW Cast Member! You will have a grand time at WDW. I understand your nervousness, but you shouldn't be. You already know WDW is the best place on earth. Since you've already met Tessa (at least via e-mail), you already have a friend at WDW. I'm sure she'll show you around as will many other Cast Members.
I love hearing about the CM/College Program Interns' experiences and will read every post you prepare.
HAVE FUN WITH IT! 